Re: Blacker blacks than black?

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In a message dated 1/21/00 11:48:43 AM, jerry_olson@und.nodak.edu writes:

>Please explain how it would be possible to get a blacker black than the
>ink is capable of delivering!
 
100% black ink, plus some balanced percent of CM&Y (whatever the paper will 
hold) may be blacker on some papers (especially uncoated watercolor papers) 
than straight black ink.  I have a set of profile targets on watercolor paper 
in front of me, and the 100% K patch is visibly paler than some of the high 
ink patches in the 300% total ink range. These patches look black, not 
tinted, and are a darker more satisfying black than the 100% K only black... 
and using a CMYK RIP the (non-text) blacks will actually print this way, 
instead of 100% K only. When profiling such targets, the spectrophotometer 
reads the increased ink amounts, and uses the point where the they don't get 
any darker with added ink as the cutoff.  Human intervention is then needed 
to set maximum ink limits, since the spectro is looking for the darkest 
decernable color, not whether the inks bleed, so without a manually entered 
ink limit such a profile can produce a print that bleeds, if the RIP also 
does not enforce ink limits (PowerRIP does, PressReady does not). Needless to 
say scanner based profiling packages would have trouble with this process 
since scanners don't read high density (very dark) patches well. But scanner 
packages are typically used for RGB profiles  (where none of this enters the 
picture, due to fixed ink limits and built in conversion settings), and tend 
to have fixed ink and black settings themselves... though they are beginning 
to offer basic features in this area (EZ 1.5, MatchLock).

C. David Tobie
Design Cooperative
CDTobie@designcoop.com
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